This conjecture is all based on a discusion on the pits ending a friend and i had a few months back now, i regret not posting it sooner as i'm certain i've forgotten much of waht we came up with but that's irrelevant.
Basically, this all stemmed from my freind noticing that one of the sprites of the shadow plunges looked like dancing violet (forgive me, i cannot remember which one) and that he noticed that she had not turned up anywhere else in the DE.
Then we looked at the other sprites of the shadow plunges, and noticed similarities between them and other characters ( again, can't remember all, but one was theorised to be Kura due to the similat battle style. I profuously apologise for forgetting these as who they are will become relevant soon in this theory, but if you attempt to look yourself ideas of who they may be will be narrowed with this next part.) Anyway, what we began to wonder if there was between the 4 people we identified as being the people behind the plunges and the fact they unlock the pits ending...
...and then it struck us. These were all people who held some sort of grudge against Rhue! Now, this is where the conjecture kicks in. These were all people who hated Rhue, but what was their connection to the pits ending. Now the pits ending is all very enigmatic and metaphorical, and has it fair share of revelation, now what if those who were in the shadow plunges represented the parts of Rhue that conflicted with himself, the inner turmoil within him? Would this mean that these were the parts of Rhue that would want to prevent him from reaching what he wanted? In short, we beleive you must defeat these people in the shadon plunges so that Rhue can purge himself of everything that is conflicting within himself, so that he can at last reveal all this to himself (I'm sorry, im not articulating this as well as i hoped). In short, you must beat those in the shadow plunges so that Rhue can show himslef the truth. The trtuh about everything.
Now, some of my friends have taken this to mean the pits is the 'true' ending. As if we are right, this means that this is the ending where we see the final truths, all doubt has gone from Rhue, he can finnaly lift the veil from under his own eyes. I disagree, i beleive it's simply Rhue discovering what he already knew. But interpret this as you will. This is merely a theory
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Next point of order. Why Rhue does what he does at the end of the Lexus and Pits ending. When Rhue jumps away at the end of the Lexus ending, this i beleive is the Phantom Slasher himself taking over Rhue as he jumps away. This i beleive is because The aurau itself has not snapped as it usually does when a new Aura becomes predominant, but is instead Rhue retreating inside the auras to live with lexus, which leaves the PS free to take over, as there is a gap for a personality left without the Auras themselves snapping.
Wheras in the pits ending, in accordance with my earlier theory, it is Rhue ( or even the mimic) coming to terms with everything, allowing himslef to let everything go. Allowing Rhue to be at peace with everything, for he has last settled all the turmoil within him (by winning the shadow plunges) and finnaly laid everyting to rest.
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Finnaly, a note on mirrors. This may have been brought up before, and if so, i aplogise. Now, it is pretty well estalished that Rhue hates mirrors, and now for the reason why. It is simply becasue by looking in a mirror, Rhue can see he doesn't look as he should, that he dislikes looking at them becasue there is one small part of him that can still tell that he isn't who he thinks. Also, i may be wrong here, but her gets slightly more tollerant of them as the game goes on. I beleive this is becasue his aura's getting more tangeled and he's getting used to who he is.
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Thankyou for taking the time to read all of this (there has been quite a lot). I hope at least some of it is new and intersting, and that if i remember or think of anymore i shall indeed share it. Again, thankyou.